文章团队:
研究背景
肠道微生物与众多疾病相关。
Inflammatory bowel disease (IBD):炎症性肠病
Crohn’s disease (CD):克罗恩病,小肠、大肠、口腔、食管、胃部等
Ulcerative colitis (UC):溃疡性结肠炎,结肠和直肠
肠病起因:
Diet + Microbiota + Intestinal barrier + Genetics
治疗方法:
研究起源:
How to identify factors influencing the gut microbiota
MaAsLin:Multivariate Association with Linear Models
How to identify factors influencing the gut microbiota
1 Correlation between parameters with PCs(gut microbiota)
2 PLS-DA -- VIP (mixOmics vip)
Methods
1:The clinical characteristics of patients with IBD and the selection of healthy controls
Wilcoxon–Mann-Whitney tests = Wilcox tests ≈ Independent T-test
Chi-squared test (χ2 tests)
计数资料的非参数检验
比较两个及两个以上样本率( 构成比)两个分类变量的关联性分析
2:Overall composition of the gut microbiota in patients with IBD and healthy controls
3: IBD genetic risk variants are associated to unfavorable gut microbiota changes in healthy controls
4:Dysbiosis in patients with CD and UC: new associations
5:Disease location is a major determinant of the gut microbiota in patients with IBD
整体到局部的分析
Shannon、PCoA→GraPhlAn→分支图→genetic variants
6:Effects of IBD disease activity/IBD disease duration on the gut microbiota
MaAsLin
7:Pathway prediction and gut microbiota function changes in patients with IBD
PICRUST→Gene composition(6910)
HUMAnN→microbial KEGG pathways(181)
How to get metabolic network in a community?
HUMAnN:The HMP Unified Metabolic Analysis Network
疾病指数对肠道菌群影响
CD : HBI指数,Enterobacteriaceae;
UC: SCCI指数,NO;
all patiets: CRP,NO;
发病时间:
longger duration => Proteobacteria;
IBD 亚型:
血清学抗体分类 => NO;
disease behavior => Faecalibacterium 下降;
哺乳方式 => 下降;
吸烟 => Bacteroidetes 增加;
饮食(素食)=> NO;
Medication => Erysipelotrichaceae 增加;
Enterococcus 增加;
Streptococcus增加;
结论:
1,发现了新的与IBD发生相关的菌群;
2,健康人宿主基因的变异与菌群构成存在关联性;
3,发现了患病部位对肠道菌群构成起决定作用;
亮点:
拟补前人研究不足:考察了其它发病部位;
样本量大;
对样本进行了详细的分类,
引用多种医学评价方法;
研究思路新颖: 考察宿主基因型与肠道菌群的相互作用;
筛选宿主相关的变异基因;
Interplay of host genetics and gut microbiota underlying the onset and clinical presentation of inflammatory bowel disease
humann2
huttenhower